Eruption of Mauna Loa and Kilauea. 123 
and doors rattled, and many were awaked from their sleep. 
Another lateral shock occurred about 1 o’clock a. m., and two 
others before 3 o’clock. 
The same shocks were noticed at Kaneohe, and one planter 
rushed out to look after his sugar house chimney; no harm came 
to it. Probably these shocks of Friday night extended over 
all of this Island. 
of Hawaii, feebly so, and Oahu only 150 miles distant, 
much more feebly, indicates that the source of the disturbance 
somewhat loosely put together as common with volcanic accu- 
mulations, must f 
suberincumbent ocean. Mauna Loa, although nearly 14,000 
feet high, and 3000 square miles in area, has only one or two 
the writer observes in his Geological Report on the Sandwich 
Islands, the larger part of the moisture that falls annually 
rc becomes subterranean. Owing to the 
numerous vertical fractures and dikes that intersect the moun- 
tain to its base (each eruption in its history having been con- 
These facts appear to afford an explanation of the recent vol- 
*inic Operations, As Rev. Mr. Coan observes, the abundance 
of rain during the preceding months may have been a predis- 
to thoy use. The vertical channels of the mountains, filled 
the ¢ brim from the rains, would have brought immense hy- 
Pe pressure upon the deep-seated water-chambers below. 
Water may thus have been forced deeply into the hot 
—— } and there suddenly converted into steam, it caused new 
hott 2. uth attendant earthquakes, and opened passages to 
soverer aie enenee came vaster rendings et ys eae ay 
: su 
took place.” and, as a natural sequence, on 
